Disclosed is a precoding method comprising the steps of: generating a first coded block and a second coded block with use of a predetermined error correction block coding scheme; generating a first precoded signal z1 and a second precoded signal z2 by performing a precoding process, which corresponds to a matrix selected from among the N matrices F[i], on a first baseband signal s1 generated from the first coded block and a second baseband signal s2 generated from the second coded block, respectively; the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T=F[i] (s1, s2)T; and changing both of or one of a power of the first precoded signal z1 and a power of the second precoded signal z2, such that an average power of the first precoded signal z1 is less than an average power of the second precoded signal z2.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A transmission method comprising: selecting a first mode or a second mode, the first mode compatible with a precoding scheme of regularly hopping between precoding matrices and the second mode not compatible with the precoding scheme of regularly hopping between the precoding matrices; when the first mode is selected, setting information indicating whether or not the regular hopping between the precoding matrices is to be executed to a first field of each transmission frame, and when the second mode is selected, disabling the first field; performing generation of: when the first mode is selected and the regular hopping between the precoding matrices is to be executed, generating, for each transmission frame, a first precoded signal z 1 and a second precoded signal z 2 from a first modulated signal s 1 and a second modulated signal s 2 with use of a precoding matrix F[i] selected from among N precoding matrices, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the first precoded signal z 1 and the second precoded signal z 2 satisfying (z 1 ,z 2 ) T =F[i](s 1 ,s 2 ) T , where (s 1 ,s 2 ) T is a transpose of a vector (s 1 ,s 2 ) and (z 1 ,z 2 ) T is a transpose of a vector (z 1 ,z 2 ); when the first mode is selected and the regular hopping between the precoding matrices is not to be executed, generating, for each transmission frame, a third precoded signal z 3 and a fourth precoded signal z 4 from the first modulated signal s 1 and the second modulated signal s 2 with use of a precoding matrix F 1 , the third precoded signal z 3 and the fourth precoded signal z 4 satisfying (z 3 ,z 4 ) T =F 1 (s 1 ,s 2 ) T , where (z 3 ,z 4 ) T is a transpose of a vector (z 3 ,z 4 ); and when the second mode is selected, generating, for each transmission frame, a third modulated signal s 3 ; performing transmission of: when the first mode is selected and the regular hopping between the precoding matrices is to be executed, transmitting a first transmission signal that is based on the first precoded signal z 1 and a second transmission signal that is based on the second precoded signal z 2 at a first time at a first frequency; when the first mode is selected and the regular hopping between the precoding matrices is not to be executed, transmitting a third transmission signal that is based on the third precoded signal z 3 and a fourth transmission signal that is based on the fourth precoded signal z 4 at the first time at the first frequency; and when the second mode is selected, transmitting a fifth transmission signal that is based on the third modulated signal s 3 at a second frequency.
A wireless transmission method selects between two modes: one that uses precoding matrix hopping and another that does not. In the first mode, a single-bit field in each transmission frame indicates whether precoding matrix hopping is enabled. If hopping is enabled, two modulated signals (s1, s2) are precoded using a matrix F[i] selected from a set of N (N >= 3) precoding matrices to generate precoded signals (z1, z2), where (z1, z2) = F[i](s1, s2). If hopping is disabled, a fixed precoding matrix F1 is used to generate precoded signals (z3, z4), where (z3, z4) = F1(s1, s2). In the second mode, a single modulated signal s3 is generated. The precoded signals (z1, z2) or (z3, z4) are transmitted at a first time and first frequency in mode 1, or the single modulated signal s3 is transmitted at a second frequency in mode 2.
2. The transmission method of claim 1 , wherein control information including the first frame is transmitted at a third time.
The transmission method of selecting between two modes: one that uses precoding matrix hopping and another that does not. In the first mode, a single-bit field in each transmission frame indicates whether precoding matrix hopping is enabled. If hopping is enabled, two modulated signals (s1, s2) are precoded using a matrix F[i] selected from a set of N (N >= 3) precoding matrices to generate precoded signals (z1, z2), where (z1, z2) = F[i](s1, s2). If hopping is disabled, a fixed precoding matrix F1 is used to generate precoded signals (z3, z4), where (z3, z4) = F1(s1, s2). In the second mode, a single modulated signal s3 is generated. The precoded signals (z1, z2) or (z3, z4) are transmitted at a first time and first frequency in mode 1, or the single modulated signal s3 is transmitted at a second frequency in mode 2. Control information including the single-bit field indicating whether precoding matrix hopping is enabled is transmitted at a third time.
3. The transmission method of claim 1 , wherein the first transmission signal and the second transmission signal are transmitted at different average transmission powers, and the fourth transmission signal and the third transmission signal are transmitted at different average transmission powers.
The transmission method of selecting between two modes: one that uses precoding matrix hopping and another that does not. In the first mode, a single-bit field in each transmission frame indicates whether precoding matrix hopping is enabled. If hopping is enabled, two modulated signals (s1, s2) are precoded using a matrix F[i] selected from a set of N (N >= 3) precoding matrices to generate precoded signals (z1, z2), where (z1, z2) = F[i](s1, s2). If hopping is disabled, a fixed precoding matrix F1 is used to generate precoded signals (z3, z4), where (z3, z4) = F1(s1, s2). In the second mode, a single modulated signal s3 is generated. The precoded signals (z1, z2) or (z3, z4) are transmitted at a first time and first frequency in mode 1, or the single modulated signal s3 is transmitted at a second frequency in mode 2. The transmission powers are adjusted such that precoded signals z1 and z2 are transmitted at different average powers. When not hopping, precoded signals z3 and z4 are also transmitted at different average powers.
4. A transmission apparatus comprising: mode selecting circuitry which, in operation: selects a first mode or a second mode, the first mode compatible with a precoding scheme of regularly hopping between precoding matrices and the second mode not compatible with the precoding scheme of regularly hopping between the precoding matrices; and when selecting the first mode, setting information indicating whether or not the regular hopping between the precoding matrices is to be executed to a first field of each transmission frame, and when selecting the second mode, disabling the first field; and precoding circuitry which, in operation performs generation of: when the first mode is selected and the regular hopping between the precoding matrices is to be executed, generating, for each transmission frame, a first precoded signal zI and a second precoded signal z. 2 from a first modulated signal si and a second modulated signal s 2 with use of a precoding matrix F[i] selected from among N precoding matrices, where i is an integer no less than 0 and no more than N−I, and N is an integer 3 or greater, the first precoded signal zI and the second precoded signal z 2 satisfying (zI,z 2 )x=F[i](sI,s 2 )f, where (sI,s 2 ) 1 is a transpose of a vector (sI,s 2 ) and (zI,z 2 ) 1 is a transpose of a vector (zI,z 2 ), when the first mode is selected and the regular hopping between the precoding matrices is not to be executed, generating, for each transmission frame, a third precoded signal z 3 and a fourth precoded signal z 4 from the first modulated signal si and the second modulated signal s 2 with use of a preceding matrix FI, the third precoded signal z. 3 and the fourth precoded signal z 4 satisfying (z 3 ,z 4 )x=F 1 (sI,s 2 )f, where (z 3 ,z 4 )x is a transpose of a vector (z 3 ,z 4 ); and when the second mode is selected, generating, for each transmission frame, a third modulated signal s 3 ; and transmission circuitry which, in operation, performs transmission of: when the first mode is selected and the regular hopping between the precoding matrices is to be executed, transmitting a first transmission signal that is based on the first precoded signal zI and a second transmission signal that is based on the second precoded signal z 2 at a first time at a first frequency; when the first mode is selected and the regular hopping between the precoding matrices is not to be executed, transmitting a third transmission signal that is based on the third precoded signal z 3 and a fourth transmission signal that is based on the fourth precoded signal z 4 at the first time at the first frequency; and when the second mode is selected, transmitting a fifth transmission signal that is based on the third modulated signal s 3 at a second frequency.
A wireless transmission apparatus has mode selection circuitry and precoding circuitry. The mode selection circuitry selects between a precoding matrix hopping mode and a non-hopping mode. It sets a field in each transmission frame to indicate whether hopping is enabled when the hopping mode is selected; otherwise, the field is disabled. The precoding circuitry generates precoded signals. In hopping mode, two modulated signals (s1, s2) are precoded using matrix F[i] from N matrices (N>=3), generating precoded signals (z1, z2) = F[i](s1, s2). In non-hopping mode, a fixed matrix F1 is used, generating (z3, z4) = F1(s1, s2). In the non-precoding mode, the precoding circuitry generates a modulated signal s3. Transmission circuitry transmits the precoded signals (z1, z2) or (z3, z4) at a first time and frequency in modes 1, or s3 at a second frequency.
5. The transmission apparatus of claim 4 , wherein the transmission circuitry transmits control information including the first frame at a third time.
The wireless transmission apparatus including mode selection circuitry and precoding circuitry where the mode selection circuitry selects between a precoding matrix hopping mode and a non-hopping mode; setting a field in each transmission frame to indicate whether hopping is enabled when the hopping mode is selected or disabling it otherwise; where the precoding circuitry generates precoded signals by using matrix F[i] from N matrices (N>=3), generating precoded signals (z1, z2) = F[i](s1, s2) in hopping mode, generating (z3, z4) = F1(s1, s2) in non-hopping mode, and generating a modulated signal s3 in the non-precoding mode; and the transmission circuitry transmits the precoded signals (z1, z2) or (z3, z4), or s3. The transmission circuitry also transmits control information, including the hopping-enabled field, at a third time.
6. The transmission apparatus of claim 4 , wherein the transmission circuitry transmits the first transmission signal and the second transmission signal at different average transmission powers, and transmits the fourth transmission signal and the third transmission signal at different average transmission powers.
The wireless transmission apparatus including mode selection circuitry and precoding circuitry where the mode selection circuitry selects between a precoding matrix hopping mode and a non-hopping mode; setting a field in each transmission frame to indicate whether hopping is enabled when the hopping mode is selected or disabling it otherwise; where the precoding circuitry generates precoded signals by using matrix F[i] from N matrices (N>=3), generating precoded signals (z1, z2) = F[i](s1, s2) in hopping mode, generating (z3, z4) = F1(s1, s2) in non-hopping mode, and generating a modulated signal s3 in the non-precoding mode; and the transmission circuitry transmits the precoded signals (z1, z2) or (z3, z4), or s3. The transmission circuitry transmits z1 and z2 at different average transmission powers. It also transmits z3 and z4 at different average transmission powers.
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October 20, 2016
July 4, 2017
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